Sub-frame and component configuration for mounting of a motorcycle drop seat

ABSTRACT

A sub-frame and component configuration for mounting on a motorcycle include a body frame structure including a main frame portion; and a sub-frame portion, he sub-frame is fixedly secured to the main frame portion and is configured for receiving and securing thereon a drop seat providing a rider with a seating area that is relatively closer to the ground than the seating area of a conventional motorcycle seat. A method of mounting the sub-frame on a motorcycle includes: fixedly securing a drop seat sub-frame portion onto a main frame portion, wherein the drop seat sub-frame portion is configured for receiving and securing thereon a drop seat.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a Continuation Application of U.S. Ser. No. 14/075,552 filed Nov. 8, 2013, which is a continuation of U.S. Ser. No. 12/804,626 filed Jul. 26, 2010, now U.S. Pat. No. 8,616,324 issued Dec. 13, 2013, which application claims priority to under 35 U.S.C. §119 U.S. Provisional Application U.S. Ser. No. 61/271,697 filed Jul. 25, 2009, herein incorporated by reference in their entirety.

BACKGROUND OF THE INVENTION

The embodiments of the present invention relate to a novel sub-frame structure for a motorcycle and to a novel spatial arrangement of motorcycle components within a cavity partially defined by the sub-frame.

SUMMARY OF THE INVENTION

A sub-frame and component configuration for mounting on a motorcycle includes a body frame structure including a main frame portion; and a sub-frame portion, he sub-frame is fixedly secured to the main frame portion and is configured for receiving and securing thereon a drop seat providing a rider with a seating area that is relatively closer to the ground than the seating area of a conventional motorcycle seat

A method of mounting the sub-frame on a motorcycle is provided and includes: fixedly securing a drop seat sub-frame portion onto a main frame portion, wherein the drop seat sub-frame portion is configured for receiving and securing thereon a drop seat.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a left side elevational view of a motorcycle including a conventional body frame structure with a conventional seat.

FIG. 2 illustrates a left side elevational view of a motorcycle including a modified body frame structure with a configuration that accommodates a seat that is lower than a conventional seat in accordance with an embodiment of the invention.

FIG. 3 illustrates a detailed view of the encircled portion 2′ denoted by a dashed line shown in FIG. 1.

FIG. 4 illustrates a detailed view of the encircled portion 2 denoted by a dashed line shown in FIG. 2 in accordance with an embodiment of the invention.

FIG. 5 illustrates a left side elevational view of a main frame of a motorcycle not attached to a sub-frame.

FIG. 6 illustrates a left perspective view of a body frame structure in accordance with an embodiment of the invention.

FIG. 7a illustrates a right perspective view of a body frame structure in accordance with an embodiment of the invention.

FIG. 7b illustrates an exploded assembly view of the body frame structure shown in FIG. 7 a.

FIG. 8a illustrates a top view of a body frame structure of a motorcycle in accordance with an embodiment of the invention.

FIG. 8b illustrates a detailed view of a sub-frame portion of the body frame structure shown in FIG. 8a in accordance with an embodiment of the invention.

FIG. 9 illustrates a right side elevational view of the body structure frame shown in FIG. 8a in accordance with an embodiment of the invention.

FIG. 10 illustrates a left side elevational view of the body structure frame shown in FIG. 8a in accordance with an embodiment of the invention.

FIG. 11 illustrates a front elevational view of the body structure frame shown in FIG. 8a in accordance with an embodiment of the invention.

FIG. 12 illustrates a rear elevational view of the body structure frame shown in FIG. 8a in accordance with an embodiment of the invention.

FIG. 13a illustrates a left side elevational view of a new sub-frame portion in accordance with an embodiment of the invention.

FIG. 13b illustrates a right side elevational view of a new sub-frame portion in accordance with an embodiment of the invention.

FIG. 14 illustrates a perspective view of a battery box in accordance with an embodiment of the invention.

FIG. 15 illustrates a perspective view of an ABS manifold bracket, an ABS module, and an ECD module in accordance with an embodiment of the invention.

FIG. 16 illustrates an assembly view of the components shown in FIGS. 14 and 15 in accordance with an embodiment of the invention.

FIG. 17a illustrates a side elevational view of a fuse box retainer and retainer wheel assembly in accordance with an embodiment of the invention.

FIG. 17b illustrates a perspective view of the fuse box retainer and retainer wheel assembly shown in FIG. 17 a.

FIG. 18 illustrates a fuse box retainer assembly including a fuse box retainer and cover in accordance with an embodiment of the invention.

FIGS. 19-46 illustrate steps involved in detaching a conventional seat sub-frame and then attaching a drop seat sub-frame to a motorcycle body frame and in repositioning and securing various components to the motorcycle in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION

The present invention generally relates to a sub-frame and component configuration for mounting of a motorcycle drop seat that provides a safe footing for a rider to ride a motorcycle. Like elements are referred to with like reference numbers throughout. Additionally, reference to “right” and “left” is referenced from a rider on a motorcycle. A conventional motorcycle seat and conventional stock sub frame as referenced herein includes seats that are seated on a stock sub frame, similar to the stock sub frame 20 b′ shown in FIG. 3, that has an upper tubular or support member having a first end attached to a main frame and extends across the sub frame along a horizontal plane to terminate at a second end extending to a rear section of a fender support frame shown to the rear of FIG. 3.

Referring to the drawings, in particular, FIGS. 1 and 2 illustrate a left side elevational view of a motorcycle 10, 10′, respectively. FIGS. 3 and 4 illustrate a detailed view of the encircled portion 2′ and 2 denoted by a dashed line shown in FIGS. 1 and 2 respectively. The conventional stock sub frame 20 b′ shown in FIG. 3 has an upper tubular or support member having a first end attached to a main frame and extends linearly and substantially coaxially with a longitudinal axis of a top mounting portion of the main frame where the stock sub frame 20 b′ attaches to the main frame 20 a across the sub frame continuously along a substantially horizontal plane to terminate at a second end, wherein the second end terminates at a rear section of the sub frame 20 b′ proximate to the fender support frame. There is no drop in height of the upper tubular or support member defining a gap or distance between the top mounting portion of the main frame and the upper tubular or support member throughout the length between the first end and the second end of the tubular stock sub-frame 20 b′ member.

As seen in FIGS. 1 and 3, a conventional motorcycle seat is 28′ mounted to a conventional sub-frame 20 b′ which is attached to an associated main frame portion 20 a to form a body frame structure 20′ shown in more detail in FIG. 3. Motorcycle 10′ includes a body frame structure 20′, a front fork 14 connected to the body frame 20′, and a front wheel 12 supported by a front fork 14. Body frame structure 20′ also supports motor 22, transmission 24, gas tank 26, and a conventional seat 28′ and various other elements (for example, a battery, ABS module, ECM module, ignition cables, etc.) which may be necessary or desirable for operation of the motorcycle. A rear wheel 16 is also connected to the body frame structure 20′ via a swing arm frame 18 or other, similar mechanism.

FIGS. 2 and 4 illustrate a motorcycle, designated generally by reference numeral 10, incorporating a sub-frame structure and associated elements in accordance with an embodiment of the present invention. Motorcycle 10 includes a body frame structure 20, a front fork 14 connected to the body frame 20, and a front wheel 12 supported by a front fork 14. Body frame structure 20 in FIG. 4 supports motor 22, transmission 24, gas tank 26, and a “drop seat” 28 and various other elements (for example, a battery, ABS module, ECM module, ignition cables, etc.) which may be necessary or desirable for operation of the motorcycle. A rear wheel 16 is also connected to the body frame structure via a swing arm frame 18 or other, similar mechanism.

A body frame structure 20 in accordance with embodiments of the present invention includes a conventional or stock main frame portion 20 a and a specially-designed sub-frame portion 20 b in accordance with embodiments of the present invention. In one embodiment, sub-frame portion 20 b (described in greater detail below) is a separate part and is configured for attachment to main frame portion 20 a using any suitable method, for example, bolts or welds. Alternatively, sub-frame portion 20 b may be formed integrally with main frame portion 20 a. Sub-frame portion 20 b is also configured for receiving and securing thereon a “drop seat” 28, shown in FIG. 1, providing a rider with a seating area that is relatively closer to the ground than the seating area of a conventional seat.

Referring to FIGS. 4, 6, 7 a, 7 b, 9-10, 13 a, 13 b, sub-frame portion 20 b includes a pair of opposed first portions 25 a, 25 b configured for attachment to main frame portion 20 a at a respective opposing main frame top mount 17 a, 17 b. In an embodiment of the invention, as shown in more detail in FIG. 4, the first portions 25 a, 25 b each have a first segment mounting portion 21 a, 21 b that each attaches to respective opposing main frame mounts 17 a, 17 b and are each in longitudinal alignment with a respective longitudinal axis Lax, Lbx of each-associated main frame top mounts 17 a, 17 b and further attach to a respective second segment portion 22 a, 22 b, each having a predefined length La1, Lb1. The second segment portions 22 a, 22 b each form a predefined angle A1 downwardly from each of the longitudinal axes Lax, Lbx of the main frame top mount 17 a, 17 b. A pair of opposed second portions 24 a, 24 b each having a predefined length La2, Lb2 are connected to respective second segment portions 22 a, 22 b of the opposed first portions 25 a, 25 b, wherein the second portions 24 a, 24 b are each respectively located a predefined distance, D below the longitudinal axes Lax, Lbx of the mainframe top mounts 17 a, 17 b to a respective point fa, fb on the second portions 24 a, 24 b. In an embodiment of the invention shown in FIG. 4, the distance D is about three inches between the longitudinal axes Lax, Lbx of the main frame top mounts 17 a, 17 b to the respective points fa, fb on the second portions 24 a, 24 b. However, the distance D may be adjustable based on the configuration of the first and second portions with respect to the main frame top mounts 17 a, 17 b, in particular, the distance D varies in accordance with the following variables: angle A1 formed between the second segment portions 22 a, 22 b and each respective one of the longitudinal axes Lax, Lbx of the main frame top mount 17 a, 17 b; the predefined lengths La1, Lb1 of the second segment portions 22 a, 22 b, and the predefined lengths La2, Lb2 of the second portions 24 a, 24 b.

As shown in FIGS. 4, 6, 7 a, 7 b, 9 (right sub-frame), 10 (left sub-frame); 13 a, 13 b a pair of opposed third portions 26 a, 26 b are connected to respective ones of the opposed second portions 24 a, 24 b and extend upwardly at a predefined angle A2 from each of the opposed second portions 24 a, 24 b, respectively. First portion 25 a, second portion 24 a, and third portion 26 a combine to form a left sub-frame portion 29 (shown in FIGS. 4, 6, 10, and 13 a) of the motorcycle, and first portion 25 b, second portion 24 b, and third portion 26 b combine to form a right sub-frame portion 30 (shown in FIGS. 4, 7 a, 9, and 13 b) of the motorcycle.

The frame portions comprising the elements of left and right sub-frame portions 29 and 30 may be connected using any suitable method. In one particular embodiment, one or more of left and right sub-frame portions 29 and 30 is formed from a single bar or piece of tubing which is bent to provide the configuration shown in FIGS. 4, 6, 7 a, 8 a, 8 b, 9-12, 13 a, 13 b. Alternatively, the constituent elements of one or more of left and right sub-frame portions 29 and 30 may be welded together or otherwise suitable connected.

FIG. 5 illustrates stock main frame portion 20 a not attached to the subframe portion 20 b.

As seen in FIG. 4, the constituent elements of each of left and right subframe portions 29 and 30 are angled with respect to each other so as to define a depression or receptacle 32 suitable for receiving a portion of the motorcycle drop seat therein. In addition, a pair of opposed fourth portions 28 a, 28 b are configured for attachment to main frame portion 20 a as shown in FIGS. 4, 6-7 a, and 7 b at bottom main frame mount 19 a, 19 b. As seen in FIGS. 4, 6-7 a, 7 b, 9-10, 13 a, 13 b third portions 26 a, 26 b and fourth portions 28 a, 28 b are connected to respective ones of a pair of opposed fifth portions 34 a, 34 b, using bolts, welds, or any other suitable means. In the embodiment shown in FIGS. 4, 6, 7 a, 7 b, 9-10, 13 a, and 13 b, fifth portions 34 a, 34 b serve as fender braces for the rear fender of the motorcycle.

In a conventional motorcycle, numerous operational components of the motorcycle are positioned within a cavity residing under the motorcycle seat and defined by portions of the motorcycle body frame. In a frame incorporating a drop seat sub-frame in accordance with embodiments of the present invention, the cavity defined by the body frame is smaller than the cavity defined by a body frame using a conventional seat and sub-frame.

As described below, in the embodiments of the present invention, novel hardware components are utilized to enable a novel spatial arrangement of the operational components within the cavity defined by the drop seat sub-frame. This novel spatial arrangement facilitates incorporation of sub-frame portion 20 b into the motorcycle frame by enabling the components to fit within the smaller cavity defined partially by the drop seat sub-frame.

As seen in FIGS. 4, 6, 7 a, 7 b, 8 a, 8 b, 9-10, 13 a, 13 b, left and right subframe portions 29 and 30, fourth portions 28 a, 28 b, and fifth portions 34 a, 34 b combine to define a cavity 40 in which various operational components of the motorcycle are received and secured, in a manner described in greater detail below. A cross-over tube 41 (see FIG. 8) extends between opposed fourth portions 28 a and 28 b. Sub-frame portion 20 b provides support and mounting points for the rear fender, shock absorbers, drop seat, tour packs, battery box, and other accessories that attach to the rear of the motorcycle. As described herein, sub-frame portion 20 b is configured for attachment to any of a variety of stock or existing main frame portions. The bars or tubing forming left and right sub-frame portions 29 and 30 may have any suitable cross-sectional shapes and dimensions and may be formed from steel, aluminum, or any other suitable material.

FIGS. 19a, 19b , and 20-46 details attachment of a sub-frame 20 b in accordance with embodiments of the present invention to a conventional main frame portion 20 a. Reference to FIGS. 19a, 19b , and 20-46 also describes detachment of operational components of the motorcycle from a conventional motorcycle body frame, and the rotation and/or repositioning and securement of the components within a cavity formed by main frame portion 20 a and sub-frame portion 20 b, in accordance with embodiments of the present invention.

Turn Signal Module

Referring to the FIGS. 6, 7 a, 7 b, 8 b, and FIGS. 27 and 35, in a component spatial arrangement in accordance with one embodiment of the present invention, a turn signal module mount 42 is configured for receiving therein a known turn signal module 43 (shown in FIGS. 27 and 35 to enable selective positioning of the turn signal module 43 within cavity 40. In the conventional motorcycle described above, the turn signal module 43 is mounted in a stock battery box 46′ (shown in FIG. 28). In the embodiments described herein, turn signal module mount 42 defines an enclosure within which the turn signal module is positioned and secured using any suitable method.

As described in FIG. 27, during installation of sub-frame 20 b and repositioning of the motorcycle components, the turn signal module 43 is removed from the stock battery box 46′ that was installed in the motorcycle, and then secured within turn signal module mount 42. Turn signal module mount 42 is attached to a cross-member of body frame structure 20 using any of a variety of known methods, such as bolts, tie-wraps, or adhesives. In a particular embodiment turn signal module mount 42 is attached to cross-over tube 41. When the turn signal module 43 is secured in turn signal module mount 42, the module mount 42 provides the module with a degree of protection from dirt, oil, and other contaminants. Turn signal module mount 42 may be formed from a metallic material, a polymer material, or any other suitable material or combination of materials.

Battery Box Assembly

Referring now to the FIGS. 6, 7 a, 7 b, 8 a, 8 b, 11-12, 13 a, 14-16, 21, 34, and 36, a battery box assembly 44 includes a battery box 46, an ABS manifold 48, an ABS module 50, a battery 45 (shown in FIGS. 21 and 36), an ECM module 54, and an ignition coil 91 (shown in FIG. 34) and ignition module 90. Battery box 46 is configured to hold a motorcycle battery and to provide mounting points for ECM module 54, ABS module 50, and the ignition coil 91 and ignition module 9. Battery box 46 includes a substantially rectangular base 46 a and two pairs of opposed walls 46 b and 46 c projecting from base 46 a to define an enclosure 46 d. An angled portion 46 e projects from one of walls 46 c. Battery box 46 is attached to a cross-member of body frame 20 and also to cross-over tube 41 using any suitable method, for example bolts, tie-wraps, or adhesive attachment. In the embodiment shown in the drawings, battery box angled portion 46 e is bolted to cross-over tube 41 to attach the battery box to sub-frame portion 20 b. In an embodiment of the invention, a portion of battery box 46 (including angled portion 46 e) is configured and positioned to serve as an extension of the motorcycle rear fender to aid in protecting the internal components of the motorcycle from road dust, spray, oil, and other contaminants. Battery box 46 may be formed from a metallic material, a polymer material, or any other suitable material or combination of materials.

ABS Assembly

To accommodate installation of the drop seat on a motorcycle which includes an ABS braking system, the ABS control module 50 is removed from its location in the stock motorcycle and re-positioned within cavity 40. The ABS module is attached to battery box 46. Referring to FIGS. 7a, 7b , 15-16, and 43, ABS module 50 is attached to an exterior of battery box 46 using any suitable method, for example bolts, tie-wraps, or adhesive attachment. The ABS module 50 is a known module used for controlling an ABS braking system in the motorcycle. To accommodate installation of the drop seat on the motorcycle incorporating a sub-frame 20 b in accordance with embodiments of the present invention, the ABS module 50 is also rotated approximately 180 degrees relative to its orientation in a conventional body frame, and then repositioned and secured farther toward the rear of the motorcycle.

An ABS manifold bracket 48 includes openings 48 a extending therethrough to facilitate connection of the brake lines to the ABS module. Referring to FIGS. 7a, 7b , 15-16, and 43, ABS manifold bracket 48 is attached directly to the ABS module 50 using any suitable method, for example bolts, tie-wraps, or adhesive attachment. The ABS manifold bracket 48 enables re-routing of the motorcycle brake lines to the new location of the ABS module 50 and connection of the motorcycle brake lines to the re-located ABS module 50.

To re-position the ABS module 50, the brake lines entering the ABS module 50 in the factory motorcycle are removed from the ABS module 50. The ABS module 50 is then removed from the motorcycle frame and attached to battery box 46 using bolts or another suitable method. The ABS manifold bracket 48 is attached to the ABS module 50, and the-motorcycle brake lines are attached to the ABS manifold bracket 48, using bolts or another suitable method. The previously detached brake lines are then re-connected to the ABS module 50 through openings 49 in the ABS manifold bracket 48. Both the brake lines and the ABS manifold openings 49 are labeled to facilitate connection of each brake line to a proper associated receptacle in the ABS module. For example, in one embodiment, four brake lines are labeled “Fm”, “MF”, “R”, and “JMR”, and ABS manifold openings directed to associated connection points on the ABS module are also labeled “Fm”, “MF”, “R”, and “MR”. The end of the brake line labeled “Fm” is inserted into the ABS manifold opening labeled “Fm” and bolted in place to the ABS manifold. The same procedure is followed for the other brake lines. In a particular embodiment the brake lines are connected to the ABS module 50 and bolted in place to the ABS using specially-designed bolts.

ECM Module

FIGS. 7b, 8b , 9, 13 b, 15-16,-19 and 42 refer to the configuration, removal and installation of ECM module 54. To accommodate installation of the drop seat on the motorcycle, the ECM module 54 is removed from its location in the stock motorcycle and re-positioned within cavity 40. In the-embodiment shown, ECM module 54 is attached to battery box 46 using bolts or another suitable method. The ECM module 54 is a stock or known electronic control module that was previously installed in the stock motorcycle 10′. In a particular embodiment, the ECM module 54 is bolted to the battery box using specially-designed bolts.

To accommodate installation of the drop seat on the motorcycle, the motorcycle ignition coil 91 is removed from its location in the stock motorcycle and repositioned within cavity 40 as shown in FIG. 34. In the embodiment shown in FIG. 34, the ignition coil is attached to battery box 46 using bolts or another suitable method. In a particular embodiment the ignition coil and ignition module 90 is bolted to the battery box 46 using specially-designed bolts.

Also, the ignition module 90 originally mounted on the motorcycle is repositioned and secured to the battery box 46. In a particular embodiment, the ignition module 90 is mounted to the rightmost side of the battery box 46, proximate the right side of the motorcycle.

Referring to FIGS. 31-32, 37-38 to accommodate repositioning of the components within the motorcycle frame structure, specially-designed extended length battery cables 66 a, 66 b (shown in FIG. 7b ) are provided for connecting the battery 45 to the starter 104, electrical circuits, ground, and the ignition system.

Referring to FIGS. 7b , 10, and 19 a, to accommodate installation of the drop seat on the motorcycle, the fuse 67 (shown FIG. 19a ) and fuse box retainer belt safety wheel assembly 76 built into the motorcycle are repositioned and incorporated into a fuse box assembly, generally designated 70. Fuse box assembly 70 includes a fuse box retainer 64, a fuse box retainer mounting bracket 64 d (shown in FIG. 13a ), a fuse box retainer cover 64 c (shown in FIG. 13a, 18b ), and the retainer box safety wheel assembly 76.

To facilitate relocation of the fuse holder 72, a fuse box retainer mounting bracket 64 d (shown in FIG. 13a ) is provided to furnish one or more mounting points for, an associated fuse box retainer 64 in which the fuse is located. The fuse box retainer mounting bracket 64 d is attached to main frame portion 20 a just below where the first segment mounting portion 21 a of sub-frame 20 b is attached to the main frame portion 20 a, on the left side of the motorcycle. The fuse box retainer mounting bracket 64 d is attached to main frame portion 20 a using bolts or another suitable method.

Fuse box retainer 64 is attached to the fuse box retainer mounting bracket 64 d using bolts or another suitable method. Fuse box retainer 64 includes a base 64 a, a series of walls 64 b projecting from the base to define an enclosure, and a mounting bracket 64 d extending from one of walls 64 b. The fuse 67 slides into fuse box retainer 64 and is held in place by a lip formed in the fuse box retainer.

The fuse box retainer 64 is also sized to receive therein a substantial portion of the motorcycle wiring harness connected to the fuses. Fuse box retainer 64 thus provides a relatively compact storage receptacle for a portion of the wiring harness, thereby freeing additional space within cavity 40 for other components.

A fuse box retainer cover 64 c (shown in FIGS. 13a , 18, and 40) is secured to fuse box retainer 64 to cover enclosure 64 c, thereby providing a substantially weather tight protective enclosure for the stock fuse box 72′ residing within the fuse box retainer 64, to aid in preventing damage to the fuses. The fuse box retainer cover 64 c is secured to fuse box retainer 64 using bolts or another suitable method.

Referring to FIGS. 5, 9, 13 a, 17 a, 17 b, 18, 39-40, a fuse box retainer safety wheel assembly 60 installed on the production motorcycle is removed from its original location on the motorcycle and is attached to fuse box retainer 64 on a side of the fuse box retainer 64 opposite the side to which the fuse box retainer mounting bracket 64 d is attached. The fuse box retainer safety wheel assembly 60 is made up of a fuse box safety retainer wheel 80 and associated hardware including a bolt 79, a washer 77 and nut 81 for attaching the wheel 80 to the fuse box retainer 64. In one embodiment, the wheel 80 is attached to the fuse box retainer 64 on a side of the fuse box retainer 64 opposite the side along which the fuse box retainer mounting 64 is attached to the fuse box retainer mounting bracket 64. Wheel 80 engages an associated drive belt (not shown).

The original function of fuse box retainer safety wheel assembly 60 is to serve as a belt tensioner for the drive belt. However, as repositioned in the embodiments of the present invention, assembly 60 serves as a belt tensioner and also as a spacing mechanism to aid in preventing contact between the belt 82 and fuse box retainer assembly 70.

Referring to FIG. 7b , a pair of side covers 88 a, 88 b is provided to enclose cavity 40 and adjacent portions of the motorcycle frame after installation of sub-frame 20 b and installation and repositioning of the motorcycle internal components as described herein. Side covers 88 a, 88 b are specially configured for attachment to a body frame 20 incorporating sub-frame 20 b and are designed to protect the internal components of the motorcycle from weather and road debris. Side covers 88 may be attached to the motorcycle frame using bolts or any other suitable method.

FIGS. 19-46 details the sequence of steps performed to remove a factory sub-frame from body frame 20, to install the drop seat frame portion 20 b, and to install and/or reposition and secure the operational components of the motorcycle as described above.

In an embodiment of the invention, a conventional sub-frame 20 b′ as is shown in more detail in FIG. 3 is removed from the stock main frame portion 20 a by removing the following stock parts from the motorcycle 10 shown in FIG. 1: the conventional seat 28′, which is replaced by the drop seat 28, shown in FIG. 1; side covers, which are replaced by new side covers 88 a, 88 b; saddlebags, which are reused; a seat strap, which may be reused, front saddlebag mounting brackets, which are reused; and an antenna, which is reused. Additionally, the following components are removed from the motorcycle 10 before installing the sub-frame portion 20 b to form motorcycle 10′ with the drop seat configuration as shown in FIG. 1: a fuse 67 from underneath a conventional fuse box retainer 64′ (shown in FIG. 18), the conventional fuse cover box retainer 64′ is replaced with a new fuse box retainer 64, an ECM 54 (shown in FIG. 19), which is reused, an ECM tray 55, which will not be reused (shown in FIG. 20); a battery 45, which is reused (shown in FIG. 21), saddlebag support bolts 100, which are reused (shown in FIG. 22); bolts 102 that hold the sub-frame 20 b′ to main frame 20 a (shown in FIGS. 23-25). Finally, before installation of the new sub-frame portion 20 b, the conventional sub-frame 20 b′ is removed from the motorcycle 10′ as shown in FIG. 26. The following components are removed or relocated before the new sub-frame 20 b is installed to form motorcycle 10 shown in FIG. 1: spark plug wires from the ignition coil; the turn signal module 43, which is relocated (shown in FIG. 27); the stock battery box 46′, which will not be reused and which is removed from the motorcycle (shown in FIG. 28); the battery cable 66 a′, which will not be reused, from the starter 104 (shown in FIG. 29) and from the fuse plug-in; the ground cable 66 b′, which will not be used, from the frame 20 (shown in FIG. 30).

Once the afore-mentioned components are removed, or relocated, the following components are installed or relocated before installing the new sub-frame 20 b: a new ground/battery cable 66 b, which has a small wire that attaches to a stud (shown in FIGS. 31-32). Next, the new sub-frame 20 b may be set into place on the motorcycle and connect to the main frame 20 a by hand-starting the bolts 102 associated with the sub-frame 20 b and then tightening with a suitable wrench. The bolts 102 may be color-coded to assure proper assembly. The following components are rerouted to fit within the associated new sub-frame components: fuse box wiring 65, the ignition coil 91 are received within a new battery box 46; the positive battery cable 66 a is rerouted (FIG. 34); the stock turn signal module 43 is installed into a new turn signal module mount 42 so that the top of the turn signal module 43 is level with a top of the frame 20 b (shown in FIG. 35); the battery 45 within the new battery box 46 (shown in FIG. 36); the ground cable 66 b is connected to the battery 45 (shown in FIG. 37); a positive battery cable 66 a is installed to a side-post of the battery 45 (shown in FIG. 38); the fuse holder 65 is installed into a new fuse box retainer assembly 64 and is mounted to the sub-frame 20 b (shown in FIG. 39); the fuse box retainer cover 64 c is installed (shown in FIG. 40). Additional wiring, including the antenna and components including the saddlebag support brackets, and the fenders may then be reinstalled, wherein the fenders may attach to the new sub-frame (shown in FIG. 41). Additionally, the ECM module 54 (FIG. 42) and optionally the ABS (anti-lock brake system) module 50, for a motorcycle having ABS may be installed in the battery box 44 as described further below. A new drop seat 28 as shown in FIG. 42 may be installed and adjusted with a seat bracket for proper fitting.

In general, a method of mounting a sub-frame and component configuration on a motorcycle includes:

fixedly securing a drop seat sub-frame portion onto a main frame portion, wherein the drop seat sub-frame portion is fixedly secured to the main frame portion and is configured for receiving and securing thereon a drop seat providing a rider with a seating area that is relatively closer to the ground than the seating area of a conventional motorcycle seat and securing a drop seat to the drop seat sub-frame portion.

Initially, a stock sub-frame portion may be removed from the main frame portion.

Additionally, a turn signal module is removed from the stock-frame portion or a stock battery box, a battery is removed from the stock battery box, and the stock battery box is removed from the motorcycle. Then, the removed turn signal module is mounted to a turn signal module mount attached to the drop seat sub frame.

The drop seat battery box may attach the drop seat sub-frame, wherein the drop seat battery box houses a battery and is adapted to receive one or more of an ABS manifold bracket, an ABS module and an ECM module there within.

Additionally an angled portion of the battery box may be attached to the cross-over tube, wherein the angled portion is configured and positioned to serve as an extension of the motorcycle rear fender to aid in protecting the internal components of the motorcycle from contaminants.

An ignition coil and an ignition mounting module may also be mounted to the drop seat battery box.

In addition, a fuse box assembly including a fuse, a fuse holder, a fuse box retainer, and a fuse box retainer safety wheel assembly may be attached to the drop-seat sub-frame.

It should be understood that the preceding is merely a detailed description of various embodiments of this invention and that numerous changes to the disclosed embodiments can be made in accordance with the disclosure herein without departing from the spirit or scope of the invention. The preceding description, therefore, is not meant to limit the scope of the invention. 

What is claimed is:
 1. A drop seat sub-frame assembly for attachment to a mainframe assembly of a motorcycle, the drop seat sub-frame assembly comprising: a forward portion having an end adapted for attachment to the mainframe assembly; a second portion having a forward and rearward end, the forward end of the second portion attached to the forward portion and the second portion extending from the forward portion at a level below the forward portion; a third portion attached to and extending from the rearward end of the second portion; and a rearward portion attached to and extending from the third portion, the rearward portion adapted for supporting a rear fender.
 2. The drop seat assembly of claim 1 wherein the forward portion comprises a first segment and a second segment, wherein the second segment connects the first segment of the forward portion with the second portion.
 3. The drop seat assembly of claim 1 further comprising: a fourth portion extending downwardly from the third portion in a direction away from the rearward portion.
 4. The drop seat assembly of claim 3 wherein the fourth portion extends from the third portion at an acute relative to the second portion.
 5. The drop seat assembly of claim 1 wherein the third portion extends at an obtuse angle relative to the second portion.
 6. The drop seat assembly of claim 1 wherein the sub-frame assembly comprises left and right sub-frame portions.
 7. The drop seat assembly of claim 2 wherein the second segment of the forward portion extends at an obtuse angle relative to the second portion.
 8. The drop seat assembly for attachment to a mainframe assembly of a motorcycle comprising: a forward portion having an end adapted for attachment to the mainframe assembly; a rearward portion adapted for supporting a rear fender; an intermediate portion extending between respective forward and rearward portions; and a first downwardly extending portion between the forward portion and the intermediate portion and a second downwardly extending portion between the rearward portion and the second portion.
 9. The drop seat assembly of claim 8 wherein the first downwardly extending portion forms an obtuse angle relative to the intermediate portion.
 10. The drop seat assembly of claim 8 wherein the second downwardly extending portion forms an obtuse angle relative to the intermediate portion.
 11. The drop seat assembly of claim 8 wherein the rearward portion is arcuate shaped having terminally descending ends.
 12. The drop seat assembly of claim 8 wherein the intermediate portion is coincident with a first plane beneath the forward and rearward portions.
 13. A drop seat sub-frame assembly for attachment to a mainframe assembly of a motorcycle, the drop seat sub-frame assembly comprising: an intermediate portion extending forward and rearward, the intermediate portion coincident with a first plane; a forward portion having an end adapted for attachment to the mainframe assembly, the end of the forward portion coincident with a second plane; a rearward portion extending from the intermediate portion, the rearward portion adapted for supporting a rear fender; and wherein the first plane of the intermediate portion is spaced above the second plane of the forward portion.
 14. The drop seat assembly of claim 13 further comprising: a segment extending opposite the end adapted for attachment to the mainframe assembly, wherein the segment extends downwardly to the intermediate portion.
 15. The drop seat assembly of claim 13 further comprising: a segment extending downwardly to the intermediate portion from the rearward portion.
 16. The drop seat assembly of claim 13 further comprising: a segment extending downwardly from the rearward portion, the segment having an end adapted for attachment to the mainframe assembly.
 17. The drop seat assembly of claim 14 wherein the segment forms an obtuse angle relative to the intermediate portion.
 18. The drop seat assembly of claim 15 wherein the segment forms an obtuse angle relative to the intermediate portion.
 19. The drop seat assembly of claim 16 wherein the segment forms an acute angle relative to the intermediate portion.
 20. The drop seat assembly of claim 13 further comprising: left and right sub-frame assemblies connected together at least in part by a cross-member attached between the intermediate portion of the left and right sub-frame assembly. 